HOW TO CHECK IF google sheets cell is empty + check if theres text code example

Example 1: excel check if cell not empty

IF(A1<>"","Not empty","Empty")

Example 2: google script check if cell is empty

var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheets()[0];
var range = sheet.getRange("B2:D4");

Logger.log(range.isBlank());